Relations and F...

Let T be the set of all triangles in the Euclidean plane, and let a relation R on T be defined as aRb if a is congruent to b, ∀a, b ∈ T. Then R is

Consider the non-empty set consisting of children in a family and a relation R defined as aRb if a is brother of b. Then R is

If a relation R on the set {1, 2, 3} be defined by R = {(1, 2)}, then R is

Let us define a relation R in R as aRb if a ≥ b. Then R is

If the set A contains 5 elements and the set B contains 6 elements, then the number of one-one and onto mappings from A to B is

Let A = {1, 2, 3, ...n} and B = {a, b}. Then the number of surjections from A into B is

Let f: R → R be defined by f(x) = 1/x, ∀ ∈ R. Then f is